The GI tract organs include the esophagus, stomach, small and large intestine.
Emphasis was put on the high fiber diet needed by rabbits to achieve optimum GI tract motility.
Furthermore, within the body the acidity of the upper GI tract renders the habitat untenable to fungi.
Bleeding in the GI tract can cause the stool (feces) to be darker than normal.
Some patients also suffer loss of protein from the body that often results in low blood levels of albumin and total protein (protein-losing enteropathy) due to increased GI tract permeability.